text: #ifndef _NET_TIMERID_H
  #define _NET_TIMERID_H
  
  #include "copyable.h"
  #include <iostream>
  
  class Timer;
  
  class TimerId : public copyable
  {
      public:
          TimerId() 
              : timer_(NULL), 
                sequence_(0) 
          {   }
  
          TimerId(Timer *timer, int64_t seq)
              : timer_(timer),
                sequence_(seq)
          {   }
  
          friend class TimerQueue;
          
      private:
          Timer* timer_;
          int64_t sequence_;
  };
  
  
  #endif // end _NET_TIMERID_H